Prophetic Commentary on the Qur'an (Tafseer of the Prophet
(pbuh))

Bukhari :: Book 6 :: Volume 60 :: Hadith 20

Narrated Ibn Umar:

While some people were at Quba (offering) morning prayer, a man
came to them and said, "Last night Quranic Verses have been
revealed whereby the Prophet has been ordered to face the Ka'ba (at
Mecca), so you too should face it." So they, keeping their
postures, turned towards the Ka'ba. Formerly the people were facing
Sham (Jerusalem) (Allah said):--

"And from whence-so-ever you start forth (for prayers), turn
your face in the direction of the Sacred Mosque of Mecca
(Al-Masjid-ul-Haram), and whence-so-ever you are, turn your face
towards it (when you pray)" (2.150)